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        <title>5.1 Shuffle 的核心要点 · 大数据 bigdata_spark_kernel-optimize_atguigu 课堂笔记</title>
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        <li class="header">第 1 部分: Spark 内核</li>
        
        
    
        <li class="chapter " data-level="1.1" data-path="../">
            
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                    第 1 章 Spark 内核概述
            
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        <li class="chapter " data-level="1.1.1" data-path="../11-spark-he-xin-zu-jian-hui-gu.html">
            
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                    1.1 Spark 核心组件回顾
            
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        <li class="chapter " data-level="1.1.2" data-path="../12-spark-tong-yong-yun-xing-liu-cheng-gai-shu.html">
            
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                    1.2 Spark 通用运行流程概述
            
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                    第 2 章 Spark 通讯架构
            
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        <li class="chapter " data-level="1.2.1" data-path="../chapter1/21-spark-tong-xun-jia-gou-gai-shu.html">
            
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                    2.1 Spark 通讯架构概述
            
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        <li class="chapter " data-level="1.2.2" data-path="../chapter1/23-spark-tong-xin-jia-gou-jie-xi.html">
            
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                    2.2 Spark 通信架构解析
            
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                    2.3 Spark 启动流程分析
            
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                    2.3.1 Master 启动源码分析
            
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                    2.3.2 Worker 启动源码分析
            
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        <li class="chapter " data-level="1.3" data-path="../di-3-zhang-spark-bu-shu-mo-shi.html">
            
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                    第 3 章 Spark 部署模式
            
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        <li class="chapter " data-level="1.3.1" data-path="../di-3-zhang-spark-bu-shu-mo-shi/31-yarn-mo-shi-yun-xing-ji-zhi.html">
            
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                    3.1 Yarn 模式运行机制
            
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        <li class="chapter " data-level="1.3.1.1" data-path="../di-3-zhang-spark-bu-shu-mo-shi/31-yarn-mo-shi-yun-xing-ji-zhi/yarn-mo-shi-yun-xing-ji-zhi-yuan-ma-fen-xi.html">
            
                <a href="../di-3-zhang-spark-bu-shu-mo-shi/31-yarn-mo-shi-yun-xing-ji-zhi/yarn-mo-shi-yun-xing-ji-zhi-yuan-ma-fen-xi.html">
            
                    
                    1. Yarn cluster 模式运行机制源码分析
            
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        <li class="chapter " data-level="1.3.1.2" data-path="../di-3-zhang-spark-bu-shu-mo-shi/31-yarn-mo-shi-yun-xing-ji-zhi/yarn-client-mo-shi-yun-xing-ji-zhi-yuan-ma-fen-xi.html">
            
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                    2. Yarn client 模式运行机制源码分析
            
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                    3.2 Standalone 模式运行机制
            
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        <li class="chapter " data-level="1.4" data-path="../di-4-zhang-spark-ren-wu-diao-du-ji-zhi.html">
            
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                    第 4 章 Spark 任务调度机制
            
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        <li class="chapter " data-level="1.4.1" data-path="../di-4-zhang-spark-ren-wu-diao-du-ji-zhi/41-spark-ren-wu-diao-du-gai-shu.html">
            
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                    4.1 Spark 任务调度概述
            
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        <li class="chapter " data-level="1.4.2" data-path="../di-4-zhang-spark-ren-wu-diao-du-ji-zhi/42-spark-stage-ji-bie-diao-du.html">
            
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                    4.2 Spark Stage 级别调度
            
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        <li class="chapter " data-level="1.4.3" data-path="../di-4-zhang-spark-ren-wu-diao-du-ji-zhi/43-spark-task-ji-bie-diao-du.html">
            
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                    4.3 Spark Task 级别调度
            
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        <li class="chapter " data-level="1.4.3.1" data-path="../di-4-zhang-spark-ren-wu-diao-du-ji-zhi/43-spark-task-ji-bie-diao-du/431-diao-du-ce-lve.html">
            
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                    4.3.1 调度策略
            
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        <li class="chapter " data-level="1.4.3.2" data-path="../di-4-zhang-spark-ren-wu-diao-du-ji-zhi/43-spark-task-ji-bie-diao-du/432-ben-di-hua-diao-du.html">
            
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                    4.3.2 本地化调度
            
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        <li class="chapter " data-level="1.4.3.3" data-path="../di-4-zhang-spark-ren-wu-diao-du-ji-zhi/43-spark-task-ji-bie-diao-du/433-shi-bai-zhong-shi-he-hei-ming-dan.html">
            
                <a href="../di-4-zhang-spark-ren-wu-diao-du-ji-zhi/43-spark-task-ji-bie-diao-du/433-shi-bai-zhong-shi-he-hei-ming-dan.html">
            
                    
                    4.3.3 失败重试和黑名单
            
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        <li class="chapter " data-level="1.4.4" data-path="../di-4-zhang-spark-ren-wu-diao-du-ji-zhi/44-ren-wu-diao-du-yuan-ma-fen-xi.html">
            
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                    4.4 Stage 级别任务调度源码分析
            
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        <li class="chapter " data-level="1.4.5" data-path="../di-4-zhang-spark-ren-wu-diao-du-ji-zhi/45-task-ji-bie-ren-wu-diao-du-yuan-ma-fen-xi.html">
            
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                    4.5 Task 级别任务调度源码分析
            
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        <li class="chapter " data-level="1.5" data-path="../di-5-zhang-spark-shuffle-jie-xi.html">
            
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                    第 5 章 Spark Shuffle 解析
            
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                    5.1 Shuffle 的核心要点
            
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        <li class="chapter " data-level="1.5.2" data-path="52-hashshuffle-jie-xi.html">
            
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                    5.2 HashShuffle 解析
            
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        <li class="chapter " data-level="1.5.3" data-path="53-sortshuffle-jie-xi.html">
            
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                    5.3 SortShuffle 解析
            
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        <li class="chapter " data-level="1.5.3.1" data-path="53-sortshuffle-jie-xi/sortshuffle-yuan-ma-jie-xi.html">
            
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                    SortShuffle 源码解析
            
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        <li class="chapter " data-level="1.6" data-path="../di-6-zhang-spark-nei-cun-jie-xi.html">
            
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                    第 6 章 Spark 内存管理
            
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        <li class="chapter " data-level="1.6.1" data-path="../61-dui-nei-he-dui-wai-nei-cun-gui-hua.html">
            
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                    6.1 堆内核堆外内存规划
            
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        <li class="chapter " data-level="1.6.2" data-path="../62-nei-cun-kong-jian-fen-pei.html">
            
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                    6.2 内存空间分配
            
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        <li class="chapter " data-level="1.6.3" data-path="../63-cun-chu-nei-cun-guan-li.html">
            
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                    6.3 存储内存管理
            
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        <li class="chapter " data-level="1.6.4" data-path="../64-zhi-xing-nei-cun-guan-li.html">
            
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                    6.4 执行内存管理
            
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        <li class="header">第 2 部分: Spark 性能优化和故障处理</li>
        
        
    
        <li class="chapter " data-level="2.1" data-path="../di-2-bu-52063a-spark-xing-neng-you-hua-he-gu-zhang-chu-li/di-7-zhang-spark-xing-neng-you-hua.html">
            
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                    第 7 章 Spark 性能优化
            
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                    7.1 常规性能调优
            
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                    7.2 算子调优
            
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        <li class="chapter " data-level="2.1.3" data-path="../di-2-bu-52063a-spark-xing-neng-you-hua-he-gu-zhang-chu-li/di-7-zhang-spark-xing-neng-you-hua/73-shuffle-diao-you.html">
            
                <a href="../di-2-bu-52063a-spark-xing-neng-you-hua-he-gu-zhang-chu-li/di-7-zhang-spark-xing-neng-you-hua/73-shuffle-diao-you.html">
            
                    
                    7.3 Shuffle 调优
            
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        <li class="chapter " data-level="2.1.4" data-path="../di-2-bu-52063a-spark-xing-neng-you-hua-he-gu-zhang-chu-li/di-7-zhang-spark-xing-neng-you-hua/74-jvm-diao-you.html">
            
                <a href="../di-2-bu-52063a-spark-xing-neng-you-hua-he-gu-zhang-chu-li/di-7-zhang-spark-xing-neng-you-hua/74-jvm-diao-you.html">
            
                    
                    7.4 JVM 调优
            
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                    第 8 章 Spark 数据倾斜解决方案
            
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                    第 9 章 Spark Troubleshooting
            
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                                <h1 id="51-shuffle-&#x7684;&#x6838;&#x5FC3;&#x8981;&#x70B9;">5.1 Shuffle &#x7684;&#x6838;&#x5FC3;&#x8981;&#x70B9;</h1>
<p><img src="http://lizhenchao.oss-cn-shenzhen.aliyuncs.com/1554698151.png-atguiguText" alt=""></p>
<p>&#x5728;&#x5212;&#x5206; Stage &#x65F6;&#xFF0C;&#x6700;&#x540E;&#x4E00;&#x4E2A; Stage &#x79F0;&#x4E3A;<code>finalStage</code>(&#x53D8;&#x91CF;&#x540D;)&#xFF0C;&#x5B83;&#x672C;&#x8D28;&#x4E0A;&#x662F;&#x4E00;&#x4E2A;<code>ResultStage</code>&#x7C7B;&#x578B;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x524D;&#x9762;&#x7684;&#x6240;&#x6709; Stage &#x88AB;&#x79F0;&#x4E3A; <code>ShuffleMapStage</code>&#x3002;</p>
<p><code>ShuffleMapStage</code> &#x7684;&#x7ED3;&#x675F;&#x4F34;&#x968F;&#x7740; shuffle &#x6587;&#x4EF6;&#x7684;&#x5199;&#x78C1;&#x76D8;&#x3002;</p>
<p><code>ResultStage</code> &#x57FA;&#x672C;&#x4E0A;&#x5BF9;&#x5E94;&#x4EE3;&#x7801;&#x4E2D;&#x7684; <code>action</code> &#x7B97;&#x5B50;&#xFF0C;&#x5373;&#x5C06;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x5E94;&#x7528;&#x5728; <code>RDD</code>&#x7684;&#x5404;&#x4E2A;<code>partition</code>&#x7684;&#x6570;&#x636E;&#x96C6;&#x4E0A;&#xFF0C;&#x610F;&#x5473;&#x7740;&#x4E00;&#x4E2A;<code>job</code>&#x7684;&#x8FD0;&#x884C;&#x7ED3;&#x675F;&#x3002;</p>
<hr>
<h2 id="511-shuffle-&#x6D41;&#x7A0B;&#x6E90;&#x7801;&#x5206;&#x6790;">5.1.1 Shuffle &#x6D41;&#x7A0B;&#x6E90;&#x7801;&#x5206;&#x6790;</h2>
<p>&#x6211;&#x4EEC;&#x4ECE;<code>CoarseGrainedExecutorBackend</code>&#x5F00;&#x59CB;&#x5206;&#x6790;</p>
<blockquote>
<p>&#x542F;&#x52A8;&#x4EFB;&#x52A1;</p>
</blockquote>
<pre class="language-"><code class="lang-scala"><span class="token keyword">override</span> <span class="token keyword">def</span> receive<span class="token operator">:</span> PartialFunction<span class="token punctuation">[</span><span class="token builtin">Any</span><span class="token punctuation">,</span> <span class="token builtin">Unit</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span>

    <span class="token keyword">case</span> LaunchTask<span class="token punctuation">(</span>data<span class="token punctuation">)</span> <span class="token keyword">=&gt;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>executor <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>

        <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
            <span class="token keyword">val</span> taskDesc <span class="token operator">=</span> ser<span class="token punctuation">.</span>deserialize<span class="token punctuation">[</span>TaskDescription<span class="token punctuation">]</span><span class="token punctuation">(</span>data<span class="token punctuation">.</span>value<span class="token punctuation">)</span>
            <span class="token comment">// &#x542F;&#x52A8;&#x4EFB;&#x52A1;</span>
            executor<span class="token punctuation">.</span>launchTask<span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> taskId <span class="token operator">=</span> taskDesc<span class="token punctuation">.</span>taskId<span class="token punctuation">,</span> attemptNumber <span class="token operator">=</span> taskDesc<span class="token punctuation">.</span>attemptNumber<span class="token punctuation">,</span>
                taskDesc<span class="token punctuation">.</span>name<span class="token punctuation">,</span> taskDesc<span class="token punctuation">.</span>serializedTask<span class="token punctuation">)</span>
        <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p><code>Executor.launchTask</code> &#x65B9;&#x6CD5;</p>
</blockquote>
<pre class="language-"><code class="lang-scala"><span class="token keyword">def</span> launchTask<span class="token punctuation">(</span>
                  context<span class="token operator">:</span> ExecutorBackend<span class="token punctuation">,</span>
                  taskId<span class="token operator">:</span> <span class="token builtin">Long</span><span class="token punctuation">,</span>
                  attemptNumber<span class="token operator">:</span> <span class="token builtin">Int</span><span class="token punctuation">,</span>
                  taskName<span class="token operator">:</span> <span class="token builtin">String</span><span class="token punctuation">,</span>
                  serializedTask<span class="token operator">:</span> ByteBuffer<span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">Unit</span> <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token comment">// Runnable &#x63A5;&#x53E3;&#x7684;&#x5BF9;&#x8C61;.</span>
    <span class="token keyword">val</span> tr <span class="token operator">=</span> <span class="token keyword">new</span> TaskRunner<span class="token punctuation">(</span>context<span class="token punctuation">,</span> taskId <span class="token operator">=</span> taskId<span class="token punctuation">,</span> attemptNumber <span class="token operator">=</span> attemptNumber<span class="token punctuation">,</span> taskName<span class="token punctuation">,</span>
        serializedTask<span class="token punctuation">)</span>
    runningTasks<span class="token punctuation">.</span>put<span class="token punctuation">(</span>taskId<span class="token punctuation">,</span> tr<span class="token punctuation">)</span>
    <span class="token comment">// &#x5728;&#x7EBF;&#x7A0B;&#x6C60;&#x4E2D;&#x6267;&#x884C; task</span>
    threadPool<span class="token punctuation">.</span>execute<span class="token punctuation">(</span>tr<span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p><code>tr.run</code>&#x65B9;&#x6CD5;</p>
</blockquote>
<pre class="language-"><code class="lang-scala"><span class="token keyword">override</span> <span class="token keyword">def</span> run<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">Unit</span> <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token comment">// &#x66F4;&#x65B0; task &#x7684;&#x72B6;&#x6001;</span>
    execBackend<span class="token punctuation">.</span>statusUpdate<span class="token punctuation">(</span>taskId<span class="token punctuation">,</span> TaskState<span class="token punctuation">.</span>RUNNING<span class="token punctuation">,</span> EMPTY_BYTE_BUFFER<span class="token punctuation">)</span>
    <span class="token keyword">try</span> <span class="token punctuation">{</span>
        <span class="token comment">// &#x628A;&#x4EFB;&#x52A1;&#x76F8;&#x5173;&#x7684;&#x6570;&#x636E;&#x53CD;&#x5E8F;&#x5217;&#x5316;&#x51FA;&#x6765;</span>
        <span class="token keyword">val</span> <span class="token punctuation">(</span>taskFiles<span class="token punctuation">,</span> taskJars<span class="token punctuation">,</span> taskProps<span class="token punctuation">,</span> taskBytes<span class="token punctuation">)</span> <span class="token operator">=</span>
            Task<span class="token punctuation">.</span>deserializeWithDependencies<span class="token punctuation">(</span>serializedTask<span class="token punctuation">)</span>

        <span class="token keyword">val</span> value <span class="token operator">=</span> <span class="token keyword">try</span> <span class="token punctuation">{</span>
            <span class="token comment">// &#x5F00;&#x59CB;&#x8FD0;&#x884C; Task</span>
            <span class="token keyword">val</span> res <span class="token operator">=</span> task<span class="token punctuation">.</span>run<span class="token punctuation">(</span>
                taskAttemptId <span class="token operator">=</span> taskId<span class="token punctuation">,</span>
                attemptNumber <span class="token operator">=</span> attemptNumber<span class="token punctuation">,</span>
                metricsSystem <span class="token operator">=</span> env<span class="token punctuation">.</span>metricsSystem<span class="token punctuation">)</span>
            res
        <span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>  
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">{</span>
    <span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span> 
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p><code>Task.run</code> &#x65B9;&#x6CD5;</p>
</blockquote>
<pre class="language-"><code class="lang-scala"><span class="token keyword">final</span> <span class="token keyword">def</span> run<span class="token punctuation">(</span>
                 taskAttemptId<span class="token operator">:</span> <span class="token builtin">Long</span><span class="token punctuation">,</span>
                 attemptNumber<span class="token operator">:</span> <span class="token builtin">Int</span><span class="token punctuation">,</span>
                 metricsSystem<span class="token operator">:</span> MetricsSystem<span class="token punctuation">)</span><span class="token operator">:</span> T <span class="token operator">=</span> <span class="token punctuation">{</span>
    context <span class="token operator">=</span> <span class="token keyword">new</span> TaskContextImpl<span class="token punctuation">(</span>
            stageId<span class="token punctuation">,</span>
            partitionId<span class="token punctuation">,</span>
            taskAttemptId<span class="token punctuation">,</span>
            attemptNumber<span class="token punctuation">,</span>
            taskMemoryManager<span class="token punctuation">,</span>
            localProperties<span class="token punctuation">,</span>
            metricsSystem<span class="token punctuation">,</span>
            metrics<span class="token punctuation">)</span>
    <span class="token keyword">try</span> <span class="token punctuation">{</span>
        <span class="token comment">// &#x8FD0;&#x884C;&#x4EFB;&#x52A1;</span>
        runTask<span class="token punctuation">(</span>context<span class="token punctuation">)</span>
    <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">{</span>

    <span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p><code>Task.runTask</code> &#x65B9;&#x6CD5;</p>
</blockquote>
<p><code>Task.runTask</code>&#x662F;&#x4E00;&#x4E2A;&#x62BD;&#x8C61;&#x65B9;&#x6CD5;. </p>
<p><code>Task</code> &#x6709;&#x4E24;&#x4E2A;&#x5B9E;&#x73B0;&#x7C7B;, &#x5206;&#x522B;&#x6267;&#x884C;&#x4E0D;&#x540C;&#x9636;&#x6BB5;&#x7684;<code>Task</code></p>
<p><img src="http://lizhenchao.oss-cn-shenzhen.aliyuncs.com/1554705785.png-atguiguText" alt=""></p>
<h3 id="shufflemaptask&#x6E90;&#x7801;&#x5206;&#x6790;"><code>ShuffleMapTask</code>&#x6E90;&#x7801;&#x5206;&#x6790;</h3>
<blockquote>
<p><code>ShuffleMapTask.runTask</code> &#x65B9;&#x6CD5;</p>
</blockquote>
<pre class="language-"><code class="lang-scala"><span class="token keyword">override</span> <span class="token keyword">def</span> runTask<span class="token punctuation">(</span>context<span class="token operator">:</span> TaskContext<span class="token punctuation">)</span><span class="token operator">:</span> MapStatus <span class="token operator">=</span> <span class="token punctuation">{</span>

    <span class="token keyword">var</span> writer<span class="token operator">:</span> ShuffleWriter<span class="token punctuation">[</span><span class="token builtin">Any</span><span class="token punctuation">,</span> <span class="token builtin">Any</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token keyword">null</span>
    <span class="token keyword">try</span> <span class="token punctuation">{</span>
        <span class="token keyword">val</span> manager <span class="token operator">=</span> SparkEnv<span class="token punctuation">.</span>get<span class="token punctuation">.</span>shuffleManager
        <span class="token comment">// &#x83B7;&#x53D6; ShuffleWriter</span>
        writer <span class="token operator">=</span> manager<span class="token punctuation">.</span>getWriter<span class="token punctuation">[</span><span class="token builtin">Any</span><span class="token punctuation">,</span> <span class="token builtin">Any</span><span class="token punctuation">]</span><span class="token punctuation">(</span>dep<span class="token punctuation">.</span>shuffleHandle<span class="token punctuation">,</span> partitionId<span class="token punctuation">,</span> context<span class="token punctuation">)</span>
        <span class="token comment">// &#x5199;&#x51FA; RDD &#x4E2D;&#x7684;&#x6570;&#x636E;.  rdd.iterator &#x662F;&#x8BFB;(&#x8BA1;&#x7B97;)&#x6570;&#x636E;&#x7684;&#x64CD;&#x4F5C;. </span>
        writer<span class="token punctuation">.</span>write<span class="token punctuation">(</span>rdd<span class="token punctuation">.</span>iterator<span class="token punctuation">(</span>partition<span class="token punctuation">,</span> context<span class="token punctuation">)</span><span class="token punctuation">.</span>asInstanceOf<span class="token punctuation">[</span>Iterator<span class="token punctuation">[</span>_ <span class="token operator">&lt;</span><span class="token operator">:</span> Product2<span class="token punctuation">[</span><span class="token builtin">Any</span><span class="token punctuation">,</span> <span class="token builtin">Any</span><span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">{</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x5177;&#x4F53;&#x5982;&#x4F55;&#x628A;&#x6570;&#x636E;&#x5199;&#x5165;&#x5230;&#x78C1;&#x76D8;, &#x662F;&#x7531;<code>ShuffleWriter.write</code>&#x65B9;&#x6CD5;&#x6765;&#x5B8C;&#x6210;.</p>
<p><code>ShuffleWriter</code>&#x662F;&#x4E00;&#x4E2A;&#x62BD;&#x8C61;&#x7C7B;, &#x6709; 3 &#x4E2A;&#x5B9E;&#x73B0;:
<img src="http://lizhenchao.oss-cn-shenzhen.aliyuncs.com/1554706770.png-atguiguText" alt=""></p>
<p>&#x6839;&#x636E;&#x5728;<code>manager.getWriter[Any, Any](dep.shuffleHandle, partitionId, context)</code>&#x4E2D;&#x7684;<code>dep.shuffleHandle</code>&#x7531;<code>manager</code>&#x6765;&#x51B3;&#x5B9A;&#x9009;&#x4F7F;&#x7528;&#x54EA;&#x79CD;<code>ShuffleWriter</code>.</p>
<h4 id="shufflemanager"><code>ShuffleManager</code></h4>
<p><code>ShuffleManage</code> &#x662F;&#x4E00;&#x4E2A;<code>Trait</code>, &#x4ECE;2.0.0&#x5F00;&#x59CB;&#x5C31;&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x5B9E;&#x73B0;&#x7C7B;&#x4E86;: <code>SortShuffleManager</code></p>
<blockquote>
<p><code>registerShuffle</code> &#x65B9;&#x6CD5;: &#x5339;&#x914D;&#x51FA;&#x6765;&#x4F7F;&#x7528;&#x54EA;&#x79CD;<code>ShuffleHandle</code></p>
</blockquote>
<pre class="language-"><code class="lang-scala"><span class="token keyword">override</span> <span class="token keyword">def</span> registerShuffle<span class="token punctuation">[</span>K<span class="token punctuation">,</span> V<span class="token punctuation">,</span> C<span class="token punctuation">]</span><span class="token punctuation">(</span>
                                         shuffleId<span class="token operator">:</span> <span class="token builtin">Int</span><span class="token punctuation">,</span>
                                         numMaps<span class="token operator">:</span> <span class="token builtin">Int</span><span class="token punctuation">,</span>
                                         dependency<span class="token operator">:</span> ShuffleDependency<span class="token punctuation">[</span>K<span class="token punctuation">,</span> V<span class="token punctuation">,</span> C<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token operator">:</span> ShuffleHandle <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>SortShuffleWriter<span class="token punctuation">.</span>shouldBypassMergeSort<span class="token punctuation">(</span>SparkEnv<span class="token punctuation">.</span>get<span class="token punctuation">.</span>conf<span class="token punctuation">,</span> dependency<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">new</span> BypassMergeSortShuffleHandle<span class="token punctuation">[</span>K<span class="token punctuation">,</span> V<span class="token punctuation">]</span><span class="token punctuation">(</span>
            shuffleId<span class="token punctuation">,</span> numMaps<span class="token punctuation">,</span> dependency<span class="token punctuation">.</span>asInstanceOf<span class="token punctuation">[</span>ShuffleDependency<span class="token punctuation">[</span>K<span class="token punctuation">,</span> V<span class="token punctuation">,</span> V<span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>SortShuffleManager<span class="token punctuation">.</span>canUseSerializedShuffle<span class="token punctuation">(</span>dependency<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>

        <span class="token keyword">new</span> SerializedShuffleHandle<span class="token punctuation">[</span>K<span class="token punctuation">,</span> V<span class="token punctuation">]</span><span class="token punctuation">(</span>
            shuffleId<span class="token punctuation">,</span> numMaps<span class="token punctuation">,</span> dependency<span class="token punctuation">.</span>asInstanceOf<span class="token punctuation">[</span>ShuffleDependency<span class="token punctuation">[</span>K<span class="token punctuation">,</span> V<span class="token punctuation">,</span> V<span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
        <span class="token keyword">new</span> BaseShuffleHandle<span class="token punctuation">(</span>shuffleId<span class="token punctuation">,</span> numMaps<span class="token punctuation">,</span> dependency<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p><code>getWriter</code> &#x65B9;&#x6CD5;</p>
</blockquote>
<pre class="language-"><code class="lang-scala"><span class="token comment">/** Get a writer for a given partition. Called on executors by map tasks. */</span>
<span class="token keyword">override</span> <span class="token keyword">def</span> getWriter<span class="token punctuation">[</span>K<span class="token punctuation">,</span> V<span class="token punctuation">]</span><span class="token punctuation">(</span>
                                handle<span class="token operator">:</span> ShuffleHandle<span class="token punctuation">,</span>
                                mapId<span class="token operator">:</span> <span class="token builtin">Int</span><span class="token punctuation">,</span>
                                context<span class="token operator">:</span> TaskContext<span class="token punctuation">)</span><span class="token operator">:</span> ShuffleWriter<span class="token punctuation">[</span>K<span class="token punctuation">,</span> V<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token comment">// &#x6839;&#x636E;&#x4E0D;&#x540C;&#x7684; Handle, &#x521B;&#x5EFA;&#x4E0D;&#x540C;&#x7684; ShuffleWriter</span>
    handle <span class="token keyword">match</span> <span class="token punctuation">{</span>

        <span class="token keyword">case</span> unsafeShuffleHandle<span class="token operator">:</span> SerializedShuffleHandle<span class="token punctuation">[</span>K<span class="token annotation punctuation">@unchecked</span><span class="token punctuation">,</span> V<span class="token annotation punctuation">@unchecked</span><span class="token punctuation">]</span> <span class="token keyword">=&gt;</span>
            <span class="token keyword">new</span> UnsafeShuffleWriter<span class="token punctuation">(</span>
                env<span class="token punctuation">.</span>blockManager<span class="token punctuation">,</span>
                shuffleBlockResolver<span class="token punctuation">.</span>asInstanceOf<span class="token punctuation">[</span>IndexShuffleBlockResolver<span class="token punctuation">]</span><span class="token punctuation">,</span>
                context<span class="token punctuation">.</span>taskMemoryManager<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
                unsafeShuffleHandle<span class="token punctuation">,</span>
                mapId<span class="token punctuation">,</span>
                context<span class="token punctuation">,</span>
                env<span class="token punctuation">.</span>conf<span class="token punctuation">)</span>
        <span class="token keyword">case</span> bypassMergeSortHandle<span class="token operator">:</span> BypassMergeSortShuffleHandle<span class="token punctuation">[</span>K<span class="token annotation punctuation">@unchecked</span><span class="token punctuation">,</span> V<span class="token annotation punctuation">@unchecked</span><span class="token punctuation">]</span> <span class="token keyword">=&gt;</span>
            <span class="token keyword">new</span> BypassMergeSortShuffleWriter<span class="token punctuation">(</span>
                env<span class="token punctuation">.</span>blockManager<span class="token punctuation">,</span>
                shuffleBlockResolver<span class="token punctuation">.</span>asInstanceOf<span class="token punctuation">[</span>IndexShuffleBlockResolver<span class="token punctuation">]</span><span class="token punctuation">,</span>
                bypassMergeSortHandle<span class="token punctuation">,</span>
                mapId<span class="token punctuation">,</span>
                context<span class="token punctuation">,</span>
                env<span class="token punctuation">.</span>conf<span class="token punctuation">)</span>
        <span class="token keyword">case</span> other<span class="token operator">:</span> BaseShuffleHandle<span class="token punctuation">[</span>K<span class="token annotation punctuation">@unchecked</span><span class="token punctuation">,</span> V<span class="token annotation punctuation">@unchecked</span><span class="token punctuation">,</span> _<span class="token punctuation">]</span> <span class="token keyword">=&gt;</span>
            <span class="token keyword">new</span> SortShuffleWriter<span class="token punctuation">(</span>shuffleBlockResolver<span class="token punctuation">,</span> other<span class="token punctuation">,</span> mapId<span class="token punctuation">,</span> context<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
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